According to 46 CFR, Subchapter J (Electrical Engineering), with respect to acceptable voltage variations for electrical equipment which statement is true if the equipment rated voltage is 450 VAC?
• 46 CFR Subchapter J – Electrical Engineering requirements for acceptable voltage variations on shipboard equipment • Typical percentage limits allowed above and below the nominal (rated) voltage for shipboard AC systems (e.g., 450 VAC systems) • How to convert percent voltage variation into an actual voltage range in volts
• First, think about what percentage below rated voltage is allowed for continuous operation under the CFR, then convert that percent of 450 VAC into volts. • Next, think about what percentage above rated voltage is allowed, and again convert that percent of 450 VAC into volts. • After calculating both the low and high limits in volts, match your calculated range to the closest choice given.
• Confirm from 46 CFR Subchapter J what the maximum percent drop below rated voltage is for equipment that must operate satisfactorily. • Confirm from the same section what the maximum percent rise above rated voltage is allowed. • When you compute the voltage limits, double‑check the math: 1% of 450 V = 4.5 V, then scale appropriately for the allowed percentage range.
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